New process of rare earth chloride has no "three wastes" and energy saving

A technology called rare earth chloride rare earth concentrate reduction roasting production technology, due to solve the rare earth production process brought about by the "three wastes" and radioactive pollution and other issues, will make China's rare earth industry is expected to achieve clean production. Last week, Lu Yuan, general manager of Baotou General Rare Earth Co., Ltd., the holder of the patent, introduced that the ton cost of the rare earth chloride product produced by the new process is 800 yuan less than that of the traditional process, and can save nearly 1/1 of the total investment. 4 The tail gas purification equipment and other end-of-pipe management investment and operating costs.

According to reports, in the rare earth industrial chain, from rare earth ore raw materials to chlorinated rare earth, it can be said that it is the most important link, and it is also the main process of extending the rare earth industrial chain to the downstream. The traditional process route of this process is currently the main source of industrial pollution of rare earth industry in China.

At present, the mixed rare earth ore concentrate accounts for about 80% of the world's rare earth industrial raw materials. China's rare earth production using mixed rare earth concentrate as raw material mainly uses traditional techniques such as sulfuric acid roasting and caustic soda decomposition, but along with the rapid expansion of processing capacity of rare earth concentrates The pollution of the environment caused by traditional processes has become more and more obvious, and the effect of treatment is also not satisfactory.

In Baotou City, China's largest source of rare earth raw materials, about 100,000 tons of rare earth concentrates are made into rare earth chlorides by sulfuric acid roasting process. The problem of environmental pollution is very serious. The first is the production of a large amount of tail gas containing fluorine and sulphur in the roasting process, followed by a large amount of industrial waste water, and tens of thousands of tons of radioactive waste containing plutonium produced each year. In order to completely solve the "three wastes" pollution problem of rare earth production and realize the clean and sustainable development of the rare earth industry, Baotou City General Rare Earth Co., Ltd. has established the "Baotou Rare Earth Concentrate Cleaner Production of Rare Earth Chloride New Process" project and achieved a breakthrough.

The process has three significant features: First, it can eliminate or minimize the pollution of the atmosphere, waste water, and waste slag formed in the traditional process from the source and production process, so that the link with the largest environmental pressure in the rare earth production chain achieves clean production; The process is simple, the consumption of auxiliary materials is low and the price is cheap, which makes the production cost of rare earth products greatly reduced; Third, the new method is based on innovative development of carbon reduction of rare earth concentrates high-cost roasting technology, goethite iron removal technology, activated defluorination The complete process of integrating phosphorous technology and conventional processes to form a complete process can be applied individually or in combination to a specific production process.

It is reported that the key special equipment designed for this technology "multi-stage countercurrent continuous solid liquid washing tank" is also a domestic initiative. The technology is also applicable to the decomposition processes of fluorocarbon rare earth concentrates produced in Sichuan, Shandong and other places, as well as rare earth concentrates of U.S. fluorocarbon rare earth concentrates and Indian monazite rare earth concentrates.

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